Quick'n'dirty implementation of pkg+foo:// URL scheme, for foo in
(http, https, ftp).

Some style improvements

Code in libpkg/fetch.c needs refactoring so we can cleanly implement
pkg+ssh://

issue #550
etags generates a file called TAGS by default.
Use new pkg+http:// URL scheme

issue #550
Add some documentation about URL schemes in PACKAGESITE settings.

Issue #550
Spelling and typo fixes
Latest links are no longer generated per category for ports with pkgng
Fix deinstallation message to say it will free space

Reported by:	mva
Make pass mode respect properly @owner/@group

In pass mode we need to resolv the uid/gid and enforce them.
Remove paking_append_file function
pkg info now default on glob matching
Print a package once for each vuln found if -q is used
Revert "Print a package once for each vuln found if -q is used"

This reverts commit 741d32572144dc9a4dd08ed67524181627d5d85b.
Print a pkg name only once - even if multiple vulns were found -  when using -q
- Part one of the language cleanup
- Add a missing man page mention for `pkg updating'
- Comment out man page mentions for `pkg plugins' and `pkg config' which
  are missing their man pages at this time
- Part two of the language cleanup
- Capitalize usage as it should be for each command
Add more alias in pkg.conf.sample file
Accept empty configuration files
Promote the inlined version of yaml rather than the classical one